package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.*;
import com.itheima.reggie.mapper.OrderMapper;
import com.itheima.reggie.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;
    /**
     * 用户下单
     * @param orders
     */
    @Override
    @Transactional
    public void submit(Orders orders) {
        //获得当前用户id
        Long userId = BaseContext.getThreadLocal();

        //查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,userId);
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(lambdaQueryWrapper);

        if (shoppingCarts == null || shoppingCarts.size() == 0){
            throw new CustomException("购物车为空,不能下单");
        }

        //查询用户数据
        User user = userService.getById(userId);

        //查询地址数据
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if (addressBook == null){
            throw  new CustomException("用户地址信息有误,不能下单");
        }

        long orderId = IdWorker.getId();//工具类生成订单号

        AtomicInteger amount = new AtomicInteger(0);//初始值:0

        //组装订单明细信息
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();//订单明细实体
            orderDetail.setOrderId(orderId);//设置订单编号
            orderDetail.setNumber(item.getNumber());//当前菜品/套餐份数
            orderDetail.setDishFlavor(item.getDishFlavor());//口味
            orderDetail.setDishId(item.getDishId());//菜品id
            orderDetail.setSetmealId(item.getSetmealId());//套餐id
            orderDetail.setName(item.getName());//菜品/套餐名称
            orderDetail.setImage(item.getImage());//图片名称
            orderDetail.setAmount(item.getAmount());//当前金额(单份)
            //计算公式:菜品的金额  乘以(multiply) 分数   从0开始累加
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());


        //组装订单数据
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);//待派送
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);//用户id
        orders.setNumber(String.valueOf(orderId));//订单号
        orders.setUserName(user.getName());//用户名
        orders.setConsignee(addressBook.getConsignee());//收货人
        orders.setPhone(addressBook.getPhone());//手机号
        orders.setAddress(
                (addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                        +(addressBook.getCityCode() == null ? "" : addressBook.getCityName())
                        +(addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                        +(addressBook.getDetail() == null ? "" : addressBook.getDetail()));//拼接省市区,详细地址
        //向订单表插入数据, 一条数据
        this.save(orders);

        //向订单明细表插入数据,多条数据
        orderDetailService.saveBatch(orderDetails);

        //清空购物车数据
        shoppingCartService.remove(lambdaQueryWrapper);

    }
}
